Quote Originally Posted by dazp1976 View Post
I was disappointed with my mill Z 34 stepper max speed on 60vdc. Accel was quick but rpm lacking.
I've recently swapped driver to a dm860t https://www.omc-stepperonline.com/download/DM860T.pdf and powering it off a new 80vdc.
Haven't got into fully testing yet.
You won't see a massive difference in speed with only 20V difference, if you want real speed with large 34 motors then you really need mains-powered drives. These give high speed and torque.